technical manual visiostar

InstrumentationDIFRA

VISIOSTAR

Visual stimulator

Technical manual*

Instrumentation DIFRA SARue de l’Eglise n°84B-4840 Welkenraedt

BELGIUMTel./fax +32 (0)87 89 80 80 / +32 (0)87 89 80 89

Email : [email protected] site : http://www.difra.be

(*) The specifications herein are subject to change without notice version 1.0

VISIOSTAR Technical manual 11. Dec. 2007

This manual is for technician only.

Opening the VISIOSTAR expose to element under high voltage.

DI1605/TM/01-E of 28 S.A. Instrumentation DIFRA


ContentsContentsContents...................................................................................................3Chapter I..................................................................................................4

General information.......................................................................4Introduction...........................................................................4

Chapter II.................................................................................................5Unpacking instructions...................................................................5

Examination of the packing..................................................5Standard contents of the packing..........................................5Examination of the device....................................................5Complain in case of damages...............................................5

Chapter III................................................................................................6General description........................................................................6

Display device.......................................................................6NAC bus...............................................................................6Disoft software......................................................................6Summary of the different versions........................................7Accessible parts on the front panel.......................................7Accessible parts on the rear panel.........................................7

Chapter IV...............................................................................................8Hardware installation.....................................................................8

Electric connection...............................................................8Interface NAC.......................................................................8Video connection..................................................................9

Software Configuration................................................................10DISOFT technical settings..................................................10DISOFT technical autorisations..........................................13DISOFT configuration........................................................14

Chapter V...............................................................................................16Operation mode............................................................................16VISIOSTAR loader......................................................................16

Description..........................................................................16Firmware replacement........................................................17Image exchange..................................................................19Maintenance........................................................................21

Chapter VI.............................................................................................22Fault location and correction........................................................22

Image is in black and white................................................22No picture on the screen.....................................................22Power led is OFF................................................................22DISOFT shows the message “VISIOSTAR not found”.....22

Chapter VII............................................................................................23Guarantee and service..................................................................23

Chapter VIII...........................................................................................24Accessories...................................................................................24

Chapter IX.............................................................................................26Appendix......................................................................................26

Technical specifications......................................................26Registration.........................................................................27Table of illustrations...........................................................28



Chapter IChapter I

General information

Introduction

This manual is the technical manual of the VISIOSTAR, visual stimulator manufactured by Instrumentation DIFRA in Belgium.

The VISIOSTAR allows to stimulate visually the patient for the diagnosis of its vestibular system. With the help of your ENG/VNG system, it performs the calibration of the system and allows you to study nystagmus occurring during the following tests: random saccades, smooth pursuit and optokinetic.

Important note: at every person who will use or maintain the VISIOSTAR, it is highly recommended to read this manual and to master this device, before using it.

This manual is divided into 9 sections:

I General informationII Unpacking instructions

III General description of the deviceIV Installation procedureV Operation mode

VI Fault location and correctionVII Guarantee and service

VIII AccessoriesIX Appendix

As with any piece of sophisticated equipment, maximum benefit will be delivered if special attention is paid to the care and maintenance of the device as well as thorough master its capabilities and functions.

If additional service is required, please contact Instrumentation DIFRA:

S.A. Instrumentation DIFRA N.V.84, Rue de l'Eglise

B-4840 WELKENRAEDTTel. : 00-32-87/89.80.80Fax. : 00-32-87/89.80.89

This manual is for technician only.Opening the VISIOSTAR expose to element under high voltage.



Chapter IIChapter IIUnpacking instructions

Examination of the packing

Before opening the package, please inspect the packing against all noticeable damage. In that case, immediately advise the carrier of the damages and keep the carton as proof.

The VISIOSTAR is delivered in a package designed for transportation. Keep it in case of back shipment.

Standard contents of the packing

Qty Designation Part number

1 VISIOSTAR DI 16051 Coaxial CINCH cable X200 CINCH 10M1 Power cord IEC 10 Amperes (only for 230V device) X200 ALIM10A1 RJ45 blue cable X200 RJ45 BL1 NAC bus ending resistor X502 CANTERMIN1 Operating manual DI160500/UM

Examination of the device

Neither the device nor its accessories must present any default of appearance at its reception. Carefully inspect the box in case the carton has been damaged while transportation! In case of problems, contact the carrier and Instrumentation DIFRA.

Complain in case of damages

Any missing or malfunctioning part should be immediately reported to the supplier of the device. Attach to your complaint a copy of the invoice, serial number and a detailed report of the problem. The serial number is on the rear panel on the identification label.

Instrumentation DIFRA takes no responsibility in case of misuse of the device.



Chapter IIIChapter IIIGeneral description

VISIOSTAR uses micro-controller and digital signal processor to offer you the best of digital technology. The device is fully controlled by computer via the NAC bus.

VISIOSTAR requires a NAC connection with a computer, the software DISOFT and a display device like a video projector or a television.

Display device

Two types of display device can be used with the VISIOSTAR : a video projector or a television.

We recommend you to use a video projector that can provide you a bigger image. We test and approve display devices with the VISIOSTAR. Contact Instrumentation DIFRA to get up to date references of such displays (video projector or television).

A television can be used in local where there is not enough space to use a video projector.

NAC bus

The NAC bus is designed by Instrumentation DIFRA in order to connect all devices to the computer with only one cable. The NAC bus offers a simple, reliable and electrically safe way to connect devices to the computer and the software DISOFT.

Disoft software

DISOFT is the software that controls all DIFRA devices. It records all data and analyze signals from exams.


Illustration 1: Disoft software


Summary of the different versions

Ref. DescriptionDI 160500 VISIOSTAR 230VDI 160501 VISIOSTAR 230 V with a 70cm televisionDI 160502 VISIOSTAR 230V with a video projectorDI 160510 VISIOSTAR 115VDI 160512 VISIOSTAR 115V with a video projector

Accessible parts on the front panel

Power led: Indicates the status of the device.● Blinking: during its start up sequence, after power up and during around 10 sec.

During this, the video output is not functional.● On: Device is ready to work. The device sends a black screen to the display and

wait for a command from the computer.● Off: if the VISIOSTAR is powered on, you are in download mode otherwise the

device is shut down or not powered.

Accessible parts on the rear panel

● I Main switch● F Fuses● P1 Power supply socket with earth● C1&C2 NAC Bus connectors● S Selector for mode selection

○ Two buttons up: Download mode;○ Two buttons down; Classic mode, position for normal use.

● V Video output● L Label with informations: Device type, video output, fuse rating, ...


Illustration 2: VISIOSTAR front panel

Illustration 3: VISIOSTAR rear panel

Power led

I

F LP1V

S

C1

C2


Chapter IVChapter IVHardware installation

The VISIOSTAR shall not be used in rooms where are explosive risks.

Electric connection

The VISIOSTAR requires a “P” power source with ground, by means of the “C” power cord (See Illustration 26), which is delivered together with the device.

Prior to connecting the VISIOSTAR to the mains, the wall plug, fuse rating and the mains wall outlet should be checked.

Interface NAC

VISIOSTAR has an interface designated to the connection on the NAC bus. The integrated profile is based on the standard CAN2.0A till 500kbit/s. The communication protocol is designed and specific to DIFRA products.

The two connectors NAC (RJ45-8) are parallel cabled. This allows you to chain different devices that have an NAC interface (only Instrumentation DIFRA manufactured devices). Devices have to be connected following a bus topology “in a line”. Avoid the bus topologies of “star” or “ring” type.


Illustration 4: Electric connection


For devices that have only one NAC connector (Like Personal computer, IDEASIII and LEDBAR), use T-connector and dead-end feeder (shorter than 0.5m) (available as accessory).

If the device constitutes the last element of the NAC bus, an ending resistance has to be connected on the free NAC connector. Two ending resistances have to be connected on your line bus. In conformity with the ISO 11898 norm, it’s highly recommended to use a bus cable with a particular impedance of 120Ω. To connect your device to your NAC Bus, do only use cables that are delivered by Instrumentation DIFRA.

The maximal length of the NAC bus cable is about 70 meters.

Video connection

VISIOSTAR has a composite video output. Depending of its configuration, the composite video output follows the NTSC standard or the PAL standard. Following to your order, you will receive a compatible device with the standard used in your country.

NTSC video standard is mainly used in North America.

PAL video standard is used in Europa.

The video output of the VISIOSTAR has to be connected to a display device. We recommend to use a video projector and the best solution is to use one of the video projector that fulfills our tests. Contact Instrumentation DIFRA to get the references of these projectors.

You can also use a television or whatever display with a video composite input. But in most cases, the screen width will be smaller than with a video projector.

Connect one side of the furnished CINCH cable at the video output of the VISIOSTAR and the other side on composite video input of the video display. Follow the display user manual in order to set the correct input.

When the VISIOSTAR is connected to the video display and powered on, it displays a black screen even without NAC connection.


Illustration 5: NAC bus topology


Software Configuration

DISOFT technical settings

• Turn on the Visiostar and its display.• On the computer, launch the software called “Difra Technical.exe”.• The password for entering inside Difra Technical is “0”(zero).• In the page “DIFRA TECHNICAL > Hardware > ViSion”.

○ Select “Visiostar” for Vision Type.○ Select “Black” as the background color. This setting is made for a classic

installation, you can adjust it to your particular wishes.○ Select “Red” as the dot color. This setting is made for a classic installation, you can

adjust it to your particular wishes.○ Set “5” as dot size. This setting is made for a classic installation, you can adjust it

to your particular wishes.• In Setting, push on “Distance” button. With the distance button ON, five points are

displayed on the screen. They will allow you to measure the size of the screen and to adjust it if it is possible.

• There are different possibilities to set the VISIOSTAR depending on the client requests. We will describe the classic configuration. For a different configuration contact Instrumentation DIFRA.

• Usually, speeds used are 20, 40 and 60°/s. To get these speeds, ideal distances are:○ For PAL display device, mainly used in Europa:

■ Patient distance: 1.7 m■ Screen width: 1.92 m■ Screen height: 1.3 m

○ For NTSC display device, mainly used in North America:■ Patient distance: 1.7 m■ Screen width: 1.6 m■ Screen height: 1.2 m

The usual distance between the video projector and the center of the screen is close to 3m.



If you are not able to use classic settings. Please choose another configuration in one of the following selection chart. If your configuration does not fit inside the chart contact Instrumentation DIFRA. We will calculate the best solution for your configuration.


Illustration 6: DISOFT technical classic configuration for PAL VISIOSTAR


Distance between the patient and the screen is measured from the patient eye to the center dot of the screen displayed by the “Distance” button in the DifraTechnical screen.

All these configurations enable to use the VISIOSTAR with the classic speed of 20,40 and 60°/s but allow also to use all multiples of 10 : 10,20,30,40,50°/s,...

Example:1. The maximum size of the screen is only 1.5m due to the size of the examination

room and the position of the video projector. You are then unable to use the previous classic distances. With a PAL configuration, you get the distance between the two horizontal dots, so screen width = 1.5m. You go inside the second chart. For 1.5m, you get as Patient-screen distance 1.33m. So you have to set the patient seat as the correct distance in order to get its eyes at 1.33m from the center dot of the screen.

2. The minimum distance between patient eyes and the screen is 1m, so patient-screen = 1m. With a NTSC configuration, you need to go inside the third chart, and for patient-screen = 1m you get the screen width of 0.94m. You will have to set the width of the screen at 0.94m. You can adjust it by modifying the distance between the video projector and the screen or with zoom possibilities of the video projector.

Speed is a discrete value with the VISIOSTAR. Depending on the configuration of your system perhaps you will not reach the speed asked but the closest speed available. Results given by DISOFT will use the real stimulation speed and not the asked speed.

For example, with a specific configuration and speeds asked 15,30,45°/s, it is possible that you get as speed step only a multiple of 7°/s. Only speeds multiple of 7 will be reachable and for a speed asked of 15°/s you will get a real speed of 14°/s, for 30°/s you get 28°/s and for 45°/s only 42°/s. So even if you had asked for 15, 30 and 45°/s and speeds indicated in DISOFT are 15, 30 and 45°/s, returned speed from the VISIOSTAR will only be 14, 28 and 42°/s. Results will be calculated from these speeds and not from the asked speeds.


0,7 0,8 0,9 1 1,1 1,2 1,3 1,4 1,5 1,6 1,7 1,8 1,9 20,79 0,9 1,01 1,13 1,24 1,35 1,47 1,58 1,69 1,8 1,92 2,03 2,14 2,26

0,75 1 1,25 1,5 1,75 2 2,25 2,5 2,75 30,67 0,89 1,11 1,33 1,55 1,77 2 2,22 2,44 2,66

0,7 0,8 0,9 1 1,1 1,2 1,3 1,4 1,5 1,6 1,7 1,8 1,9 20,66 0,75 0,85 0,94 1,03 1,13 1,22 1,32 1,41 1,5 1,6 1,69 1,79 1,88

0,75 1 1,25 1,5 1,75 2 2,25 2,5 2,75 30,8 1,06 1,33 1,6 1,86 2,13 2,39 2,66 2,93 3,19

For Pal device, with distance between patient and screen fixed:Patient-screenScreen widthOr with screen width fixedScreen widthPatient-screen

Maximum field view of 59° for Pal display device.

For NTSC device, with distance between patient and screen fixed:Patient-screenScreen widthOr with screen width fixedScreen widthPatient-screen

Maximum field view of 50° for NTSC display device.All distances are given in meter. As reminder 1 meter = 3.28 feet.


DISOFT technical autorisations

In the page “DIFRA TECHNICAL > AUTORISATIONS”, put your password to activate exams links to the VISIOSTAR:

● Calibration 1: calibration saccades exam;● Calibration 2: calibration pursuit exam;● Spontaneous: spontaneous exam;● Optokinetic; optokinetic exam;● Random sac.: random saccade exam;● Smooth pursuit; smooth pursuit exam.

For the password, contact Instrumentation DIFRA.


Illustration 7: DiSoft Technical licenses management


In the DISOFT program, exams links to the VISIOSTAR appears.

DISOFT configuration

In the recording screen of the software, there are settings for each exams. These settings can be modified by entering the options screen. The options screen is available for each exam. To enter in this screen, select the exam in the available tests column. Click on “Options”. You get one of the following screen depending of the available test.


Illustration 8: DiSoft recording

Illustration 10: Smooth pursuit settingsIllustration 9: Optokinetic settings


These settings configure DISOFT for the use of the VISIOSTAR. To save all these settings, exit DISOFT with “Configuration saveguard” marked (See Illustration 15).

For all other configurations and settings see DISOFT User Manual.


Illustration 13: Calibration saccades

settings

Illustration 15: Save configuration in DISOFT

Illustration 11: Spontaneous settingsIllustration 12:

Random saccades settings

Illustration 14: Calibration pursuit settings


Chapter VChapter V

Operation mode

See DISOFT User Manual for configuring and utilizing exams.

VISIOSTAR loader

DescriptionVISIOSTAR loader is a software that enables you to update or modify some parameters

of the device memory. These parameters are :● Firmware;● Panorama for the horizontal optokinetic;● Image for dot replacement.

These modifications are possible with the NAC bus between the computer and the VISIOSTAR. Modifications will be stored in the memory of the VISIOSTAR.

Launch the software “VISIOSTAR loader”.

Function description:● A: Read ID button: not used.● B: Mickey button: replace the image that can replace the dot as stimulus.● C: Panorama button: replace the panorama view in the horizontal optokinetic exam.● D: Program button: replace the firmware of the VISIOSTAR● E: Counter: in image exchange, allow to follow progresses of the process.


Illustration 16: VISIOSTAR loader main windows

A B C D E


Firmware replacement

Firmware of the VISIOSTAR can be updated in order to get the last device improvement or bug correction.

The update requires the software “VISIOSTAR loader” and a “RWStimu.ldr”file. The “RWStimu.ldr” file contains the new firmware for the device.

1. Turn on the VISIOSTAR.2. Launch the software “VISIOSTAR loader”.3. Click on “Program” button (see Illustration 16).4. A pop-up window appears (see Illustration 17) and ask to change the position of the

“Mode selection” button on the backside of the VISIOSTAR (see Illustration 3). Push upside the selector. Device is now in download mode.

5. Click on “OK” when you have positioned the selector upside.6. Select the new file “RWStimu.ldr” on your computer. And click on “OK” when you

have selected it.


Illustration 17: Pop-up window for download mode

Illustration 18: New firmware selection


7. Process will first erase the memory and the previous firmware from the device.

8. The counter (“E” on Illustration 16) will show you the progression of the upload process.

9. Firmware exchange will process until you get the “Transfer finished” window.

10. Click on “OK” of the pop up window will automatically close the software.11. Replace the selector of the mode selection down and wait until the power led (see

Illustration 2) is always ON.12. The firmware of the VISIOSTAR is now updated and you can use it as usual.


Illustration 20: Transfer finished

Illustration 19: Memory erasing


Image exchange

Two images can be changed: the panorama used for the horizontal optokinetic and the image that can replace the dot. The process is similar, so the two changes will be explained in the same time.

1. First thing to do is to create new images. The VISIOSTAR requests to have images in a specific format.• Images have to be in a “*.bmp” file. This format can be obtained with the software

“PAINT” in a Windows operating system.• The BMP file has to be in a 256 colors, also called 8 bits. This can be done with the

function “Save as” of Paint and by a correct selection of the file format.

• The size of the image is important.○ For the Mickey image, size is fixed: 48 x 48 pixels.○ For the panorama, vertical size is fixed at 576 pixels and horizontal size can vary

from 720 to 13848 pixels. 720 pixels is the length of one screen. If you use such length the image will be fixed in optokinetic. You should have at least 4 to 5 screens with the image. A value close to 3600 pixels is better.You can also obtain or set the image size with “PAINT”, in the menu “Image” select “Attributes”


Illustration 21: Paint configuration for 256 colors


2. With your new images, we will upload them in the memory of the VISIOSTAR.3. Start you VISIOSTAR.4. Launch the software “VISIOSTAR loader” (see Illustration 16).5. Click on the “Mickey” button (Button “B” on Illustration 16) if you want to change this

image or on the “Panorama” button (Button “C” on Illustration 16) if you want to change the panorama.

6. A pop-up window appears (see Illustration 23) and ask to change the position of the “Mode selection” button on the backside of the VISIOSTAR (see Illustration 3). Push upside the selector. Device is now in download mode.

7. Click on “OK” when you have positioned the selector upside.8. Select the new image and click on the OK button (see Illustration 18).13. Process will first erase the memory and the previous firmware from the device (See

Illustration 19).9. The counter (“E” on Illustration 16) will show you the progression of the upload

process.10. When the upload is finished. You get the message shown in Illustration 20.14. Click on “OK” of the pop up window will automatically close the software.11. Replace the selector of the mode selection down and wait until the power led (see

Illustration 2) is always ON.12. The image of the VISIOSTAR is now updated and you can use it as usual.


Illustration 23: Pop-up window for download mode

Illustration 22: PAINT attributes


Maintenance

No service operation may be carried out by the user.

An annual checking of your VISIOSTAR will guarantee a precise and reliable operation.

The cleaning of the apparatus must be only carried out by means of a wet linen.

Do not clean with large water, not to use corrosive substances.



Chapter VIChapter VI

Fault location and correction

This manual is for technician only.Opening the VISIOSTAR expose to element under high voltage.

Fault Cause SolutionImage is in black and white

Error during start up Reset the VISIOSTARProblem remains Contact Instr. DIFRA

No picture on the screen Bad connection Verify all NAC cables and the video cable

Is the power led ON? See Power led OFFVerify input mode of the display device.

See User manual of the display device

Problem remains Contact Instr. DIFRAPower led is OFF Is the device powered? Check supply and fuses.

Is selector mode in classic mode? See Illustration 3.

Mode selector is down

Problem persists. Contact Instr. DIFRADISOFT shows the message “VISIOSTAR not found”

Is power led ON? See Power led is OFFCheck NAC connections between the computer and the VISIOSTAR.

Check the switch on the support

Check selector mode position Put it down side.Problem persists Contact Instr. DIFRA



Chapter VIIChapter VIIGuarantee and service

The VISIOSTAR is warranted by Difra to be free of defects in materials and workmanship at the time of purchase for a period of one year.

The warranty covers both piece parts and labor. The warranty is only applicable if the original invoice mentioning model, serial number and purchase date is presented. Costs and risks of transport as well as removal and installation of VISIOSTAR, and any other costs directly or indirectly related to the actual repair of the VISIOSTAR, are not covered by this warranty.

The warranty is not applicable:• to damages caused by accident, negligence, modifications, use of non-DIFRA spare

parts, improper use or installation;• to damages caused by lightening, water, fire, acts of war, public disturbances, incorrect

main voltages, incorrect ventilation or any other cause beyond the control of DIFRA;• for repairs performed by non-authorized repair shops;• if such repairs damage this VISIOSTAR.



Chapter VIIIChapter VIII

Accessories

Cable CINCH 10mOrder n°: X200 CINCH10M

NAC cable 3mOrder n°: X200 RJ45BL


Illustration 24: CINCH cable

Illustration 25: NAC cable


Power cord 10AOrder n°: X200 ALIM 10A

NAC ending resistorOrder n°: X200 CAN TERMIN


Illustration 26: Power cord

Illustration 27: NAC ending resistor


Chapter IXChapter IX

Appendix

Technical specifications1

Power supplyDI 16050...........................................................................230 VAC 50HzDI 16051...........................................................................115 VAC 60Hz

Power input.......................................................................................... 10 WattsFuses

-230-......................................................................................2 x 0,25 A T-115-........................................................................................2 x 0,5 A T

Connection..................................................................................................NAC

Video output.....................................................Composite video PAL or NSTC

Weight..........................................................................................................3 kg

DimensionWidth............................................................................................310 mmDepth............................................................................................280 mmHeight.............................................................................................80 mm

Classification IEC601-1...........................................................................Class I

The technical manual can be obtained on written request by the biotechnical service

1 These specifications are given for information only and are subject to change without notice.DI1605/TM/01-E of 28 S.A. Instrumentation DIFRA


Registration Ref. : 16DIF017Rev. : 18.02.99/001 Page : 27/28

Questionnaire « Service and Products Evaluation »Written by : Approved by :

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Table of illustrations

Illustration 1: Disoft software.......................................................................................................6Illustration 2: VISIOSTAR front panel........................................................................................7Illustration 3: VISIOSTAR rear panel..........................................................................................7Illustration 4: Electric connection................................................................................................8Illustration 5: NAC bus topology.................................................................................................9Illustration 6: DISOFT technical classic configuration for PAL VISIOSTAR...........................11Illustration 7: DiSoft Technical licenses management...............................................................13Illustration 8: DiSoft recording..................................................................................................14Illustration 9: Optokinetic settings..............................................................................................14Illustration 10: Smooth pursuit settings.......................................................................................14Illustration 11: Spontaneous settings...........................................................................................15Illustration 12: Random saccades settings...................................................................................15Illustration 13: Calibration saccades settings..............................................................................15Illustration 14: Calibration pursuit settings.................................................................................15Illustration 15: Save configuration in DISOFT...........................................................................15Illustration 16: VISIOSTAR loader main windows....................................................................16Illustration 17: Pop-up window for download mode...................................................................17Illustration 18: New firmware selection......................................................................................17Illustration 19: Memory erasing..................................................................................................18Illustration 20: Transfer finished.................................................................................................18Illustration 21: Paint configuration for 256 colors......................................................................19Illustration 22: PAINT attributes.................................................................................................20Illustration 23: Pop-up window for download mode...................................................................20Illustration 24: CINCH cable......................................................................................................24Illustration 25: NAC cable..........................................................................................................24Illustration 26: Power cord.........................................................................................................25Illustration 27: NAC ending resistor..........................................................................................25


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